fig3

Figure 3. (A) XPS survey spectra of FCS, Pt@CS, and Pt@FCS; (B) High-resolution Pt 4f spectra highlighting the distinct electronic states of Pt species on Pt@CS and Pt@FCS; (C) O 1s spectra of CS, FCS, and Pt@FCS; (D) Pt L₃-edge XANES spectra of Pt foil, Pt@CS, and Pt@FCS; (E) FT-EXAFS spectra illustrating the distinct first-shell coordination environments in Pt@CS and Pt@FCS; (F) EXAFS fitting of Pt@FCS; (G-I) WT contour plots of Pt@FCS, Pt foil, and Pt@CS. XPS: X-ray photoelectron spectroscopy; FCS: functionalized carbon support; CS: carbon support; XANES: X-ray absorption near edge structure; FT-EXAFS: Fourier transform extended X-ray absorption fine structure; WT: wavelet transform.